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Physical Science
PROPERTIES AND CHANGES OF PROPERTIES IN MATTER
- Substances react chemically in characteristic ways
with other substances to form new substances (compounds)
with different characteristic properties. In chemical
reactions, the total mass is conserved. Substances often
are placed in categories or groups if they react in
similar ways; metals is an example of such a group.
TRANSFER OF ENERGY
- Energy is a property of many substances and is
associated with heat, light, electricity, mechanical
motion, sound, nuclei, and the nature of a chemical.
Energy is transferred in many ways.
STRUCTURE OF THE EARTH SYSTEM
- Some changes in the solid earth can be described as
the "rock cycle." Old rocks at the earth's surface
weather, forming sediments that are buried, then
compacted, heated, and often recrystallized into new
rock. Eventually, those new rocks may be brought to the
surface by the forces that drive plate motions, and the
rock cycle continues.
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